Texas Instruments PCMD3140 PDM-Input to TDM- or I²S-Output Converter
Texas Instruments PCMD3140 PDM-Input to TDM- or I2S-Output Converter offers a simultaneous sampling of up to four digital channels for the PDM microphone input. The PCMD3140 integrates programable digital volume control, a microphone bias voltage, a phase-locked loop (PLL), a programmable high-pass filter (HPF), biquad filters, low-latency filter modes while allowing for output sample rates up to 768kHz.
The TI PCMD3140 PDM-Input to TDM- or I2S-Output Converter features audio serial data interfaces including time-division multiplexing (TDM), I2S, or left-justified (LJ) audio formats. Additionally, the device is controlled with the I2C interface or master and slave mode selection for the audio bus interface operation.
Combining these integrated high-performance features and the ability to be powered from a single supply of 3.3V or 1.8V allows the PCMD3140 to be an ideal choice for space-constrained audio systems in far-field microphone recording applications.
The PCMD3140 Converter is available in a 20-pin WQFN package and is specified from –40°C to +125°C.
Features
- 4-channel PDM microphones simultaneous conversion
- PDM input to TDM or I2S output converter performance:
- 127dB dynamic range (DR) with high performance, 5th-order PDM input
- 117dB dynamic range (DR) with high performance, 4th-order PDM input
- Channel summing mode, DR performance with high-performance, 4th-order PDM input:
- 120dB, 2-channel summing
- Programmable PDM clock output of 768kHz to 6.144MHz
- Programmable output sample rate (fS) of 8kHz to 768kHz
- Programmable channel settings:
- –100dB to 27dB Digital volume control
- Gain calibration at 0.1dB resolution
- Phase calibration at 163ns resolution
- Microphone bias or supply voltage generation
- Voice activity detection (VAD)
- Low-latency signal processing filter selection
- Programmable HPF and biquad digital filters
- I2C control
- Integrated high-performance audio PLL
- Automatic clock divider setting configurations
- Audio serial data interface:
- TDM, I2S, or left-justified (LJ) format
- 16-bits, 20-bits, 24-bits, or 32-bits Word length
- Master or slave interface
- 3.3V or 1.8V Single-supply operation
- 3.3V or 1.8V I/O-supply operation
- Power consumption for 1.8V supply:
- 2.8mW/channel at 16kHz sample rate
- 3.6mW/channel at 48kHz sample rate
Applications
- Video doorbell
- Smart speakers
- Building security gateway
- IP network cameras
- GPS personal navigation device
- Video conference systems
Associated Products
Texas Instruments PCMD3140EVM-PDK Performance Demonstration Kit
A platform for evaluating the performance and capabilities of the PCMD3140.
Additional Resources
Functional Block
Simplified Block Diagram
